ET MALWARE Cindy C2 SSH Server Banner

Query · suricata

flow:established,to_client;
content:"SSH-2.0-OpenSSH_8.6p1 "; fast_pattern;
pcre:"/^Cindy[^\x40]*\x40v(?:\d+\x2e){1,2}\d+/R";
target:src_ip;
Raw source ET MALWARE Cindy C2 SSH Server Banner · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert ssh any any -> $HOME_NET any (
    msg:"ET MALWARE Cindy C2 SSH Server Banner";
    flow:established,to_client;
    content:"SSH-2.0-OpenSSH_8.6p1 "; fast_pattern;
    pcre:"/^Cindy[^\x40]*\x40v(?:\d+\x2e){1,2}\d+/R";
    reference:url,censys.com/pivoting-for-nosviak/;
    classtype:command-and-control;
    sid:2059673; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2025_01_27, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2025_01_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)

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